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Title: Temperature dependence of non-radiative energy transfer in hybrid structures of InGaN/GaN nanorods and F8BT films

Hybrid organic/inorganic white light emitting structures have been fabricated based on a combination of high efficiency InGaN/GaN multiple quantum well (MQW) nanorod arrays and a yellow emitting co-polymer F8BT, leading to a minimised separation between them in order to achieve high efficiency non-radiative energy transfer (NRET). The NRET efficiency has been found 6.7 times higher at room temperature than at 7‚ÄČK. This is attributed to the existence of strong exciton localization the InGaN MQWs, which can undergo thermally activated delocalization at high temperatures. The enhanced NRET efficiency is not only due to the delocalized MQW excitons, but also enhanced by the increased exciton diffusion at higher temperatures. This behaviour highlights the potential for high efficiency NRET in down-conversion hybrid white light emitting diodes operating at room temperature.
Authors:
; ; ;  [1]
  1. Department of Electrical and Electronic Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD (United Kingdom)
Publication Date:
OSTI Identifier:
22310645
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CONVERSION; COPOLYMERS; DIFFUSION; EFFICIENCY; ENERGY TRANSFER; EXCITONS; FILMS; GALLIUM NITRIDES; INDIUM COMPOUNDS; LIGHT EMITTING DIODES; NANOSTRUCTURES; QUANTUM WELLS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K; VISIBLE RADIATION